Output Matrix in For Loop duplicates. Why?
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hi, I have a text file which I unpacked using importdata, and then quads.
M = importdata('Textfile.txt');
quads = M.data;
x = length(quads);
for i=1:x-1
quads(i)=quads(i+1)-quads(i);
P(i)= quads(i)/60;
end
the output is duplicated.
it will say
quads =
value
value
value
quads =
value
value
value
quads =
value
value
value
Is this because the TextFile.txt is a double array (as it says in Workspace) when I unpack it in Matlab?
----
A second question is I am trying to add up the differences in all the values and ultimately get the final value. How can I do this using a For Loop?
For ex; if the textfile contains
3
6
8
10
12
The differences between 3-0 = 3, 6-3 = 3, 8-6=2, and so forth..
3
3
2
2
2
Sum of all these = 12. The final value. What code can I add to my For Loop above?
回答（1 个）
KALYAN ACHARJYA
2018-10-15
编辑：KALYAN ACHARJYA
2018-10-16
In the second case, you can do this way
A=[3 6 8 10 12];
B=[0;A'];
sum1=0;
[rows colm]=size(B);
for i=1:rows-1
sum1=sum1+B(i+1,:)-B(i,:);
end
disp(sum1);
Command Window
>> 12
Recommended: There may another method to do the same without using a loop. (logical indexing)
4 个评论
KALYAN ACHARJYA
2018-10-16
编辑：KALYAN ACHARJYA
2018-10-16
sum1=[sum1];
disp(sum1);
Walter Roberson
2018-10-16
We recommend that you not use sum as the name of a variable. If you get in the habit of using sum as the name of a variable, it is pretty much inevitable that at some point in code after you have made sum into a variable, that you will try to invoke sum() as a function.
KALYAN ACHARJYA
2018-10-16
编辑：KALYAN ACHARJYA
2018-10-16
@Walter Sir Thanks #Gratitude
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2018-10-16
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